DOCS-11201: add blurb for deprecation of snapshot for non-mmapv1 engine

Author: kay-kim

source/release-notes/3.6-compatibility.txt

@@ -538,10 +538,15 @@ Deprecated Options
 
 .. versionchanged:: 3.6.1
 
-- MongoDB 3.6.1 deprecates the ``snapshot`` query option. You can use
-  :method:`~cursor.hint()` on the ``{ _id: 1}`` index instead to
-  prevent a cursor from returning a document more than once if an
-  intervening write operation results in a move of the document.
+- MongoDB 3.6.1 deprecates the ``snapshot`` query option. 
+
+  For MMAPv1, use :method:`~cursor.hint()` on the ``{ _id: 1}`` index
+  instead to prevent a cursor from returning a document more than once
+  if an intervening write operation results in a move of the document.
+  
+  For other storage engines, use :method:`~cursor.hint()` with ``{
+  $natural : 1 }`` instead.
+
 
 - MongoDB 3.6.1 deprecates the ``$isolated`` option. For more
   information on read isolation, see